Question

please fill in the blank below.
while both offer nonprinting lines which assist in the accurate placement of images and objects, lines are unique to a specific image, while grid lines are the same for all images.

Explanation:

The description differentiates between two types of non - printing lines for image placement. One is unique to a specific image and the other is common for all images. The term for the lines unique to a specific image is "guide lines".

Answer:

guide